static read_method_decl(pack_non_delta)
{
size_t total_read = 0;
switch (st->z_state) {
case z_unused:
memset(&st->z, 0, sizeof(st->z));
git_inflate_init(&st->z);
st->z_state = z_used;
break;
case z_done:
return 0;
case z_error:
return -1;
case z_used:
break;
}
while (total_read < sz) {
int status;
struct pack_window *window = NULL;
unsigned char *mapped;
mapped = use_pack(st->u.in_pack.pack, &window,
st->u.in_pack.pos, &st->z.avail_in);
st->z.next_out = (unsigned char *)buf + total_read;
st->z.avail_out = sz - total_read;
st->z.next_in = mapped;
status = git_inflate(&st->z, Z_FINISH);
st->u.in_pack.pos += st->z.next_in - mapped;
total_read = st->z.next_out - (unsigned char *)buf;
unuse_pack(&window);
if (status == Z_STREAM_END) {
git_inflate_end(&st->z);
st->z_state = z_done;
break;
}
if (status != Z_OK && status != Z_BUF_ERROR) {
git_inflate_end(&st->z);
st->z_state = z_error;
return -1;
}
}
return total_read;
}
void fast_import_sha1write(struct sha1file *f, const void *buf,
unsigned int count)
{
if (!pack_win) {
pack_win = xcalloc(1, sizeof(*pack_data->windows));
pack_win->offset = 0;
pack_win->len = 20;
pack_win->base = xmalloc(packed_git_window_size);
pack_win->next = NULL;
}
/* pack_data is not set the first time sha1write is called */
if (pack_data && !pack_data->windows) {
pack_data->windows = pack_win;
pack_data->pack_size = pack_win->len;
}
sha1write(f, buf, count);
pack_win->last_used = -1; /* always last used */
pack_win->inuse_cnt = -1;
if (pack_data)
pack_data->pack_size += count;
if (packed_git_window_size - pack_win->len >= count) {
memcpy(pack_win->base + pack_win->len - 20, buf, count);
pack_win->len += count;
} else {
/* We're closing the window, so we don't actually need
* to copy the beginning of the data, only what will
* remain in the new window. */
pack_win->offset += (((off_t) pack_win->len - 20 + count)
/ packed_git_window_size) * packed_git_window_size;
pack_win->len = count % packed_git_window_size -
(packed_git_window_size - pack_win->len);
memcpy(pack_win->base, buf + count - pack_win->len + 20,
pack_win->len - 20);
/* Ensure a pack window on the data before that, otherwise,
* use_pack() may try to create a window that overlaps with
* this one, and that won't work because it won't be complete. */
sha1flush(f);
if (prev_win)
unuse_pack(&prev_win);
use_pack(pack_data, &prev_win,
pack_win->offset - packed_git_window_size, NULL);
}
}
